| 摘要 |
To provide a magnetic pole position detector for an inner rotor type brushless DC motor having a rotor with permanent magnets, and a stator with armature coils, surrounding the outside circumference of said rotor, wherein said detector has excellent water-tight and air-tight properties, is capable of effecting size reduction, and suited to a power drive for mobile objects. In addition, to provide an annular sheet with sheet-like magnets for use with this detector. The magnetic pole position detector comprises a magnet retainer ring fixed to the end face of a rotor so as to be positioned radially inside the coil ends of armature coils for retaining sheet-like magnets magnetized in the direction parallel to a rotary shaft at the same angular intervals as the permanent magnets on the rotor; and magnet sensors disposed facing, in the direction parallel to the rotary shaft, sheet-like magnets retained in the magnet retainer ring fixed to the stator for detecting the rotational angular position of the rotor. <IMAGE> |
